/*
 * Copyright (c) 2008-2013, Hazelcast, Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.hazelcast.mapreduce.aggregation.impl;

import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.nio.serialization.IdentifiedDataSerializable;

import java.io.IOException;

/**
 * Internal tuple type for average calculations, used to transmit data between
 * Combiner and Reducer implementations.
 *
 * @param <F> first value type
 * @param <S> second value type
 */
public class AvgTuple<F, S>
        implements IdentifiedDataSerializable {

    private F first;
    private S second;

    AvgTuple() {
    }

    public AvgTuple(F first, S second) {
        this.first = first;
        this.second = second;
    }

    public F getFirst() {
        return first;
    }

    public S getSecond() {
        return second;
    }

    @Override
    public int getFactoryId() {
        return AggregationsDataSerializerHook.F_ID;
    }

    @Override
    public int getId() {
        return AggregationsDataSerializerHook.AVG_TUPLE;
    }

    @Override
    public void writeData(ObjectDataOutput out)
            throws IOException {

        out.writeObject(first);
        out.writeObject(second);
    }

    @Override
    public void readData(ObjectDataInput in)
            throws IOException {

        first = in.readObject();
        second = in.readObject();
    }
}
